What do you use for back pain?

I do yoga to heal the pain. When I do yoga regularly, my body stays in great shape and nothing wrong. but some period when I got lazy for several months, I might have some slightly back pain--because of long time in front of computer. In those cases, I started doing yoga, the 1st day of yoga can makes me sense how heavy and weak my body is, after 2 or 3 days, the back pain got healed. I guess this might not work so efficient on serious back pain, but anyway, it helps.